Originally Posted by
lazerzxr
I think what drives the bike forward is a loss of tension in the bottom of the chain which allows the tension in the top to be released.
Also the pedals are driven around by the rider pulling up on them and not pushing.
The spokes pointing forward "push" the rim while the spokes pointing back "pull" the rim. It's amazing how so many of you just don't get it.... or I should say, refuse to get it.